Stretches of time (4)

I think it could be either:

Which length description are you looking for?:

eras

'stretches of time' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eras that I've seen before include "typeface" , "Epochs" , "Periods, ages" , "Periods of time" , "Long and distinct periods of history" .)

I've seen this clue in The New York Times.

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